I don't think there's going to be hard numbers on that. The point is she's not as rich as Harry Osborn or Liz for that matter, referring just to Peter's social circle (leave alone the upper echelons of wealth in the MU - your Emma Frosts, your Starks, your Professor Xaviers, your Reed Richards). She's a working class girl who's moved in the middle classes and in that gray precarious area inside the middle to middling to lower-rungs of the upper-middle.
It's that class that draws salaries but because of expenditures and lifestyle owing to the work (for a model and actress that means trainers, and other stuff) they don't get to keep much or any of that salary or translate it into savings. It's a kind of advanced precarious class. As an actress and working model, MJ gets perks and privileges (like travelling in fancy jets or dressing in grand style on ocassion and sometimes keeping some of the clothes but not all the time of course) so she gets the trappings of wealth without actual wealth.
So she's just a little better off than Peter but not as rich as Harry, and certainly not as rich as Gwen Stacy and her family.
Is Jennifer Garner a successful actress? When was the last time she appeared in any major movie? Jolie of course is tops.As far as MJs carreer...I want her to be a successful working actress...not Angelina Jolie, Jennifer Garner, or the like
She's already doing all of that....but pulling in comfortable money withe stage and TV work in NY...and the occasional out of town filming.